Electrical Units Flashcards
(10 cards)
A positive electric pole
(a) has a deficiency of electrons.
(b) has fewer electrons than the negative pole.
(c) has an excess of electrons.
(d) has more electrons than the negative pole.
a
An EMF of 1 V
(a) cannot drive much current through a circuit.
(b) represents low resistance.
(c) can sometimes produce a large current.
(d) drops to zero in a short time.
a
A potentially lethal electric current is on the order of
(a) 0.01 mA
(b) 0.1 mA
(c) 1 mA
(d) .1 A
a
A current of 25 is most likely drawn by
(a) a flashlight bulb.
(b) a typical household.
(c) a utility power plant.
(d) a small radio set.
a
A piece of wire has a conductance of 20 S. It’s resistance is
(a) 20 Ω
(b) 0.5 Ω
(c) 0.05 Ω
(d) 0.02 Ω
a
A resistor has a value of 300 Ω. It’s conductance is
(a) 3.33 mS.
(b) 33.3 mS.
(c) 333 µ
(d) .333 S
a
A span of wire 1 km long has a conductance of 0.6 S. What is the conductance of a span of this same wire that is 3 km long
(a) 1.8 S
(b) 0.6 S
(c) 0.2 S
(d) More information is necessary to determine this.
a
Approximately how much current can 2-kW generator reliably deliver at 117 V?
(a) 17 mA
(b) 234 mA
(c) 17 A
(d) 234 A
a
A circuit breaker is rated for 15 A at 117 V. Approximately how much power does this represent?
(a) 147 kWh
(b) 14.7 kWh
(c) 1.47 kWh
(d) 0.147 kWh
a
a
a
